Legend and vertical scroll

### Feature Proposal

<img width="773" height="245" alt="Image" src="https://github.com/user-attachments/assets/c3646a24-eb98-424f-ba2b-6df8c1259d63" />

The following setting is missing: The legend should be strictly in one column, and if necessary, a vertical scroll should be shown if there are more than 5 values ​​in the legend.

### Possible Implementation

_No response_